这个模式叫什么？软锁？ [英] What is this pattern called? Soft Lock?

问题描述

这里有一些代码，我有时要写，主要是与UI的东西，总是与事件可以意外地卷入无限循环。

  public class MyClass 
 {
 public event EventHandler MyEvent; 
 private bool IsHandlingEvent = false; 
 
 public MyClass（）
 {
 MyEvent + = new EventHandler（MyClass_MyEvent）; 
} 
 
 void MyClass_MyEvent（object sender，EventArgs e）
 {
 if（IsHandlingEvent）{return; } 
 
 IsHandlingEvent = true; 
 {
 //代码在这里处理事件，可能再次调用MyEvent。 
 // IsHandlingEvent标志用于避免冗余处理。这个
 //技术是什么，或者叫做模式。 
 // ... 
} 
 IsHandlingEvent = false; 
} 
} 
  

正如你所看到的，使用标志'IsHandlingEvent'用于防止冗余或可能无休止的事件调用。虽然我不总是这样做（因为明显的危险），有时它是一个有用的解决方案，但我不知道该叫什么。由于缺乏一个更好的术语，我一直在使用软锁。真正的名字是什么？

编辑：

是的，我知道它不是线程安全的这是一个名字问题，而不是设计问题。但是值得讨论...

代码改进：更好地替代这种模式？

解决方案

已经有很多关于设计的说法（不是线程安全的等等）。

你似乎要求一个名字...不知道这是否普遍，但我听到几次被称为可重入哨。 / p>

Here is a bit of code that I have to write sometimes, mostly in conjunction with UI stuff, and always with events that can accidentally wind up in infinite loops.

  public class MyClass
  {
    public event EventHandler MyEvent;
    private bool IsHandlingEvent = false;

    public MyClass()
    {
      MyEvent += new EventHandler(MyClass_MyEvent);
    }

    void MyClass_MyEvent(object sender, EventArgs e)
    {
      if (IsHandlingEvent) { return; }

      IsHandlingEvent = true;
      {
        // Code goes here that handles the event, possibly invoking 'MyEvent' again.
        // IsHandlingEvent flag is used to avoid redundant processing.  What is this
        // technique, or pattern called.
        // ...
      }
      IsHandlingEvent = false;
    }
  }

As you can see, using the flag 'IsHandlingEvent' is used to prevent redundant, or possible endless event invocations. While I don't always do stuff like this (because of obvious dangers), sometimes it is a useful solution, but I don't know what to call it. For lack of a better term, I have been using "soft lock". What is the real name?

EDIT:
Yes, I know that it isn't threadsafe, etc. This is a name question, not a design question. But since it is worth discussing...
Code improvement: Better alternatives to this pattern?

解决方案

There is already alot said about the design (being not thread-safe etc.).

You seem to ask for a name... don't know if this widespread but I heard it several times referered to as a reentrancy sentinel.

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